Question

several excited states of the neon atom are important in the
operation of a helium-neon laser. In these excited states, one
electron of the neon atom is promoted from the 2p level to a higher
energy orbital
An excited neon atom with a 1s22s2
2p5 5s1 electron configuration can emit a
photon with a wavelength of 3391 nm as it makes a transition to a
lower energy state with a
1s22s22p54p1 electron
configuration makes a transition to a lower energy state with a
1s22s22p53p1 electron
configuration, it emits a photon with a wave length of 632.8 nm.
Find the wave length of the photon that would be emitted in a
transition from the
1s22s22p54p1 electron
configuration to the
1s22s22p53p1 electron
configuration. ( It should help if you start by drawing an
energy-level diagram)